APA (7th ed.) Zitazioa
Showers, K. B. (2005). Imperial gullies: Soil erosion and conservation in Lesotho. Ohio University Press.
Chicago Style (17th ed.) Zitazioa
Showers, Kate Barger. Imperial Gullies: Soil Erosion and Conservation in Lesotho. Athens: Ohio University Press, 2005.
MLA (9th ed.) Zitazioa
Showers, Kate Barger. Imperial Gullies: Soil Erosion and Conservation in Lesotho. Ohio University Press, 2005.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.